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1.
在寻求可再生能源供应及解决环境问题的迫切需求下,光电、光催化、电催化等领域中多种技术被开发以解决这一迫切问题。其中,光催化技术因其可将清洁太阳能转化为化学燃料的优越能力而备受关注。在层出不穷的光催化材料中,具有阳离子可替代性的钙钛矿氧化物(ABO3)在电子信息、太阳能电池和光催化等领域具有极大的潜力。由于这类材料具有活性高、成本低、稳定性好、结构易调控等独特性能,钙钛矿氧化物光催化剂在水分解、二氧化碳还原转化、固氮等方面取得了广泛的应用。本文综述了光催化的结构与合成方法,重点介绍了光催化的应用,最后展望了光催化的未来发展前景。  相似文献   

2.
本文综述了半导体氧化物光催化裂解水制氢的反应机理,以及近年来半导体光催化裂解水制氢的研究进展.讨论了各种因素对材料光催化性能的影响以及改性方法,并对今后的研究方向提出了一些建议.  相似文献   

3.
黄昀昉  吴季怀 《化学进展》2006,18(7):861-869
本文综述了半导体氧化物光催化裂解水制氢的反应机理,以及近年来半导体光催化裂解水制氢的研究进展。讨论了各种因素对材料光催化性能的影响以及改性方法,并对今后的研究方向提出了一些建议。  相似文献   

4.
本文综述了半导体氧化物光催化裂解水制氢的反应机理,以及近年来半导体光催化裂解水制氢的研究进展。讨论了各种因素对材料光催化性能的影响以及改性方法,并对今后的研究方向提出了一些建议。  相似文献   

5.
钙钛矿型复合氧化物光催化研究进展   总被引:9,自引:0,他引:9  
扼要叙述了钙钛矿型复合氧化物(ABO3)作为光催化剂的研究进展。包括结构,机理,制备,改性和研究现状。强调了结构与性能之间的关系并对其研究方向提出了自己的见解。  相似文献   

6.
利用半导体材料光催化还原CO2合成可燃物是目前解决能源危机和缓解温室效应的理想途径.本文对几种钙钛矿型材料,包括纯无机卤化物钙钛矿材料、金属有机钙钛矿材料、氧化物型钙钛矿材料和复合型钙钛矿材料在光催化还原CO2领域的应用进行了简单的归纳与总结.  相似文献   

7.
钙钛矿型氧化物的制备与光催化性能研究进展   总被引:8,自引:3,他引:8  
综述了近年来国内外钙钛矿型氧化物的制备方法及其影响因素,总结了这类材料在光催化降解有机物和光催化分解水方面的研究进展,讨论了光催化反应机制及影响光催化活性的因素,并展望了今后对钙钛矿型氧化物研究与应用的发展方向.  相似文献   

8.
在寻求可再生能源供应及解决环境问题的迫切需求下,光电、光催化、电催化等领域中多种技术被开发以解决这一迫切问题。其中,光催化技术因其可将清洁太阳能转化为化学燃料的优越能力而备受关注。在层出不穷的光催化材料中,具有阳离子可替代性的钙钛矿氧化物(ABO_3)在电子信息、太阳能电池和光催化等领域具有极大的潜力。由于这类材料具有活性高、成本低、稳定性好、结构易调控等独特性能,钙钛矿氧化物光催化剂在水分解、二氧化碳还原转化、固氮等方面取得了广泛的应用。本文综述了光催化的结构与合成方法,重点介绍了光催化的应用,最后展望了光催化的未来发展前景。  相似文献   

9.
综述了ABO3钙钛矿复合氧化物及以TiO2为基础的复合氧化物的光催化研究进展,探讨了光催化降解机理、光催化剂的应用,影响光催化效率的因素及提高光催化性能的途径等方面的内容,并展望了今后的工作重点及发展方向。  相似文献   

10.
系统总结了金属有机框架(MOFs)基材料在光催化还原CO2中的最新研究进展, 其中包括MOFs直接作为光催化剂和作为复合光催化2个主要部分, 讨论了MOFs基光催化剂在催化还原CO2方面展现出的独特优势, 并对MOFs基光催化剂的结构稳定性与CO2转化效率等问题进行讨论与分析, 对未来发展趋势进行了展望.  相似文献   

11.
    
Recently, artificial and semi-artificial photosynthesis have attracted extensive attentions in addressing the crisis of energy from fossil fuels and reducing excessive CO2 emission. Metal-organic frameworks (MOFs) have been considered as ideal platforms for constructing artificial photosynthesis systems due to their unique properties like large specific surface area, high porosity and diverse framework topology, and tunable functionalities. This review discussed the characteristics, superiorities and challenges of MOF-based photocatalysts, and detailed summarization of several common design strategies for MOF-based artificial systems, including i) enhancement of light absorption, ii) acceleration of the charge separation and transfer, and iii) introduction of additional active units. Particularly, we give examples showing the applications of MOF-based photocatalysts, where the mechanisms of superior photocatalytic activity and selectivity are also analyzed, thereby providing theoretical guidance for rational design of MOF-based photocatalysts. Finally, the challenges and future research directions of MOF-based photocatalysts are prospected.  相似文献   

12.
As one of the most appealing and attractive technologies, photocatalysis is widely used as a promising method to circumvent the environmental and energy problems. Due to its chemical stability and unique physicochemical, graphitic carbon nitride (g-C3N4) has become research hotspots in the community. However, g-C3N4 photocatalyst still suffers from many problems, resulting in unsatisfactory photocatalytic activity such as low specific surface area, high charge recombination and insufficient visible light utilization. Since 2009, g-C3N4-based heterostructures have attracted the attention of scientists worldwide for their greatly enhanced photocatalytic performance. Overall, this review summarizes the recent advances of g-C3N4-based nanocomposites modified with transition metal sulfide (TMS), including (1) preparation of pristine g-C3N4, (2) modification strategies of g-C3N4, (3) design principles of TMS-modified g-C3N4 heterostructured photocatalysts, and (4) applications in energy conversion. What is more, the characteristics and transfer mechanisms of each classification of the metal sulfide heterojunction system will be critically reviewed, spanning from the following categories: (1) Type I heterojunction, (2) Type II heterojunction, (3) p-n heterojunction, (4) Schottky junction and (5) Z-scheme heterojunction. Apart from that, the application of g-C3N4-based heterostructured photocatalysts in H2 evolution, CO2 reduction, N2 fixation and pollutant degradation will also be systematically presented. Last but not least, this review will conclude with invigorating perspectives, limitations and prospects for further advancing g-C3N4-based heterostructured photocatalysts toward practical benefits for a sustainable future.  相似文献   

13.
    
Graphitic C3N4 (g−C3N4) is one of the most popular two-dimensional (2D) materials as a milestone of metal-free photocatalysis for solar water splitting. However, pure g−C3N4 presents a poor efficiency of electron-hole separation. Here by first-principles calculations, we propose that without any chemical modification, the electron-hole separation can be significantly promoted by just rippling g−C3N4. Interestingly, the rippled structures are found more stable than complanate structure in thermodynamics. Furthermore, a lateral Type-II heterojunction is formed in rippled g−C3N4 between the strongly and hardly rippled areas, with the valence band maximum (VBM) and conduction band minimum (CBM) of the whole structure spatially separated. Thus the photo-generated electrons and holes are driven to different regions in rippled monolayer g−C3N4. Our work reveals the rippled g−C3N4, with potential advantage of high efficiency of electron-hole separation, is a flexible and promising platform for metal-free photocatalytic water splitting.  相似文献   

14.
皂土固载金属酞菁用于光催化还原CO2的反应   总被引:4,自引:0,他引:4  
制备了三种皂土固载金属酞菁(ZnPc,CoPc,NiPc),研究了它们在可见光照射下,对CO2还原反应的催化作用.MPc/皂土作为P-型半导体,光照下可产生电子转移得到MPc. .研究结果表明,皂土固载金属酞菁比未固载金属酞菁具有更好的催化性能和重复使用性能,而且与酞菁中心配位的金属对其催化性能有影响,本实验中ZnPc/皂土较好,其负载量为1.0%.  相似文献   

15.
    
Chao Gao  Yujie Xiong 《中国化学》2022,40(1):153-159
Constituting the artificial carbon cycle,for example,through recycling CO2 and converting CH4 to value-added fuels and chemicals with solar energy,offers a sustainable future for humankind to tackle the global environmental issues and energy crisis.However,significant bottlenecks remain in such photocatalytic conversion,mainly related to the reaction activity and product selectivity.Herein,we share our efforts and systematic research progress on addressing the double bottlenecks for achieving solar-driven artificial carbon cycle,with specifically focusing on the photocatalytic CO2 and CH4 conversion.We further elucidate the common fundamentals behind various designed photocatalytic materials systems.Toward future development,we highlight the opportunities and challenges in the research field.  相似文献   

16.
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This review gave a brief summary on the main species, engineering and characterizations of defects on the TiO2-realted model photocatalyst.  相似文献   

17.
Cr-doped SrTi1−xCrxO3 (x=0.00, 0.02, 0.05, 0.10) powders, prepared by solvothermal method, were further characterized by ultraviolet-visible (UV-vis) absorption spectroscopy. The UV-vis spectra indicate that the SrTi1−xCrxO3 powders can absorb not only UV light like pure SrTiO3 powder but also the visible-light spectrum (λ>420 nm). The results of density functional theory (DFT) calculation illuminate that the visible-light absorption bands in the SrTi1−xCrxO3 catalyst are attributed to the band transition from the Cr 3d to the Cr 3d+Ti 3d hybrid orbital. The photocatalytic activities of chromium-doped SrTiO3 both under UV and visible light are increased with the increase in the amounts of chromium.  相似文献   

18.
单原子催化剂在光催化二氧化碳还原中的研究进展   总被引:1,自引:0,他引:1  
通过光催化技术将二氧化碳转化成增值的含碳化学品或燃料是解决能源危机和温室效应的一种可持续性方法. 开发高效、 廉价及高稳定性的光催化剂是提高光催化二氧化碳还原(CO2RR)效率所面临的一大挑战. 单原子催化剂由于具有原子利用率高及电子环境可调等特性而在催化领域被广泛研究. 在光催化二氧化碳还原中, 金属单原子的加入不仅可调节光催化剂的能带结构及吸光性能等物理性质, 还可以有效提高其光生电荷转移效率, 并为研究光催化反应机理提供理想的平台. 近年来, 单原子光催化剂在二氧化碳还原领域的研究发展迅速. 本文综合评述了单原子催化剂在光还原二氧化碳反应中的研究进展, 介绍了不同载体的单原子催化剂的典型研究成果, 并展望了未来的研究趋势.  相似文献   

19.
商林杰  刘江  兰亚乾 《应用化学》2022,39(4):559-584
Covalent organic frameworks (COFs)are a class of emerging materials connected by covalent bonds,which have high thermal/chemical stability (except boric acid COFs),permanent porosity,large specific surface area and good crystallinity. In addition,the structure of the monomer unit in COFs is adjustable and can coordinate with many transition metal ions to provide catalytic active sites. These advantages make COFs helpful to catalyze various reactions. Among them,COFs have an excellent catalytic effect on the CO2 reduction reaction(CO2 RR). This is mainly because the adjustable pore structure of COFs allows them to adsorb a large amount of CO2 and the π-π stacking structure in COFs can promote charge transfer, which can greatly improve the efficiency of CO2 reduction. COFs can be used as photo/ electrocatalysts to efficiently reduce CO2 to CO,CH4 ,HCOOH and other products. This review discusses the important achievements of CO2 RR catalyzed by COFs, including photo/electrocatalytic CO2 RR and photoelectric coupling CO2 RR. In addition,the future development of COFs as CO2 RR catalysts is also prospected. © 2022, Science Press (China). All rights reserved.  相似文献   

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